I manage 7000 acres in Oregon. I have killed close to 200 badgers in 3 years.I killed the last one a few days ago.
When it is cool,(spring,fall) hunt the first and last hour of daylight.Glass from the feild edge,park your rig and get into a spot close to the badger. Closer is better,because they don't like to cover lots of ground.In the summer when its hot "hunt the weather". Badgers don't like heat,rain or wind.You can spotlight all night,and if its windy never see one,or on a calm cool night you can kill 4 or 5 in good country.
If calling, bird sounds work excellent,or rodent sounds.High pitch and fast chirps are the sounds that work best.Bear in mind lots of badgers will just poke their head up and look,but not come close.If this happens wait for them to "go down",and get as close as you can as fast as you can.get within 100yrds,get ready to shoot, then call.When the head pokes up,shoot!!!.
I have taken many paid hunters out after badgers,and on one day /night hunts I am 80%.There are lots of tricks, and the more badgers you hunt, the more you will learn.
If you want more info send a pm, I'll share somemore stuff with you.
This is one from a few days back.
28# badger
33# badger
30# badger, caught with dogs
The catch, I was takin pics, the "boys" killed the badger.He thought he was tough,but found out he wasn't.
This is the result of 3 hours huntin at daylight.
I don't want to jam you up with pics, I'm just showin that I "know alittle". If you really want some info,send a pm.
Duane.